Finding the Fourth Proportional to 67,978.56, 101,911.68 and 30,000.78

Step by Step Solution

1. Step 1: Write the proportion equation
   67,978.56 : 101,911.68 = 30,000.78 : x
2. Step 2: Convert to fraction form
   67,978.56/101,911.68 = 30,000.78/x
3. Step 3: Cross multiply
   67,978.56x = 101,911.68 × 30,000.78
4. Step 4: Simplify right side
   67,978.56x = 3,057,429,891.11
5. Step 5: Solve for x
   x = 3,057,429,891.11/67,978.56
6. Step 6: Final answer
   x = 44,976.39